How to classify this environment?
The environment is : 


Deterministic : the future state of the environment (and the agent) is defined by the agent's action.
Partially Observable (partially accessible) : since his sensors don't see what's beyond the shaded barrier, the environment is partially observable (accessible).
Sequential (non-episodic): Since the agent's current action will constrain and affect the space of possibilities (options, choices) of future actions, current decisions are not independent of future ones.
Discrete : Environment is not continuous, that is, every action/step/case is finite (either turn left, right, forward or backward), you don't have other actions, which makes it a discrete task environment.
Static : the environment is not changing, it's static, only the agent is moving.